Is this a new development or has it been like this for a while? And if it's been a while...did it occur around the time some other work or other malfunction/change/upgrade/mod occurred?

If you have diagnostic software/hardware, you could always hook it up and communicate with the control modules to see if there's a fault code registered...anything other than that will be a guess at what it could be if there's no other signs or symptoms that might lead us in some direction.